Progesterone is a natural progesterone produced by the corpus luteum of the ovary, which can inhibit ovulation by suppressing the secretion of pituitary gonadotropins, thus delaying menstruation. Precautions for taking the drug 1. If you want to delay your period, you need to start taking progesterone 5-7 days before your menstrual flow and keep taking it until you need to let your period come. During this period, the drug progesterone can maintain the luteal function, but 2-7 days after stopping the drug, it will stimulate the endometrium in the secretory phase of necrosis, exfoliation, resulting in withdrawal bleeding; 2. Before taking progesterone to postpone menstruation, it is recommended to go to the hospital to check the blood HCG and ultrasound to clarify whether you are pregnant. If you are pregnant, you need to follow medical advice to use it carefully, because synthetic progesterone may have teratogenic effects on the fetus; 3. Long-term use of progesterone may have adverse reactions, such as endocrine disruption, affecting ovulation, dizziness, nausea, increased risk of blood clots, etc., so long-term use is not recommended. Progesterone other role progesterone in addition to the role of delaying menstruation, but also has the role of suppressing contractions, fetal protection, so the use of the drug needs to follow the doctor’s instructions strictly take, not to increase or decrease the drug without permission, so as not to play the opposite effect.